Malicious PDF — malware analysis report

Static analysis result for SHA-256 94530eaff6455199…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 10:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 315980d5a35982325a8678f7095c8bc4 SHA-1: 46e82bc06bd6f809dd9c2a2e1e61a67ebef83154 SHA-256: 94530eaff645519974c280c2f8d774c91d64a6d5e830040607f1e7cba086b910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports the lure to trick users into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=sebi+recruitment+2019+notification+pdf PDF link annotation
    • http://czerwoneiczarne.pl/files/file/47862531096.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499c4ca92b---lupugadibik.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/sifakupilip.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abd22c11683---meruti.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/jekifemefofumuzutizixuwil.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/70823869728.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/54411861045.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f760e72ecee8d8ae00afb27e09a525ae/xexubugedeferotibi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/h7qaanlk9j29j7uu7lbjn929f6/forivivafoboxunusape.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/karuzadategujos.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/13208631852.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/dasiwuzerij.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/taxumujupuwada.pdfIn PDF document text
    • http://myphamasia.net/upload/files/5045323440.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b715ba583b1---1945727355.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/mka33cbbtfflnh11ae7rdvmsv5/womozap.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/78042870631.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6120d070182a1.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5951e9af---magijibakedanisodaxebari.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/bilajogilaseraroza.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wubulexisufomer.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/24b5e5e55a5efb92596ca312116d23bc/bixoselex.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 17236 bytes
SHA-256: 63b1d34154babc1ba144e0941e25b00fd28028738dd69eb59cabd76d152c3f8a
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 11344 bytes
SHA-256: 650e5d6c26c9e1239ac335a31e6fc753d806997202a8101925440243c9ba4263

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